Hermagis Eidoscope no#3 1:5 aperture Scale?

[zoneVIII]

I have Hermagis Eidoscope no#3, with aperture 5 6 7 10 14 20
does anybody know what number of aperture is this in modern aperture scale?

Thanks
Haryanto

[zoneVIII]

I already see this thread, but didn't find it
http://www.largeformatphotography.info/forum/showthread.php?26346-Old-Aperture-scape-on-a-Hermagis-lens

[Jason Greenberg Motamedi]

It is the modern scale, just not the points you are used to. So, assuming it is a linear scale (my Eidoscope is) f5.6 is a little more than half way between 5 and 6, and f11 is a quarter of the way between 10 and 14...

[zoneVIII]

Thank you Jason